<template>
  <view class="uni-easyinput" :class="{ 'uni-easyinput-error': msg }" :style="boxStyle">
    <view class="uni-easyinput__content" :class="inputContentClass" :style="inputContentStyle">
      <uni-icons v-if="prefixIcon" class="content-clear-icon" :type="prefixIcon" color="#c0c4cc"
                 @click="onClickIcon('prefix')" size="22"></uni-icons>
      <textarea
          v-if="type === 'textarea'"
          class="uni-easyinput__content-textarea"
          :class="{ 'input-padding': inputBorder }"
          :name="name"
          :value="val"
          :placeholder="placeholder"
          :placeholderStyle="placeholderStyle"
          :disabled="disabled"
          placeholder-class="uni-easyinput__placeholder-class"
          :maxlength="inputMaxlength"
          :focus="focused"
          :autoHeight="autoHeight"
          :cursor-spacing="cursorSpacing"
          @input="onInput"
          @blur="_Blur"
          @focus="_Focus"
          @confirm="onConfirm"
          @keyboardheightchange="onkeyboardheightchange"
      ></textarea>
      <input
          v-else
          :type="type === 'password' ? 'text' : type"
          class="uni-easyinput__content-input"
          :style="inputStyle"
          :name="name"
          :value="val"
          :password="!showPassword && type === 'password'"
          :placeholder="placeholder"
          :placeholderStyle="placeholderStyle"
          placeholder-class="uni-easyinput__placeholder-class"
          :disabled="disabled"
          :maxlength="inputMaxlength"
          :focus="focused"
          :confirmType="confirmType"
          :cursor-spacing="cursorSpacing"
          @focus="_Focus"
          @blur="_Blur"
          @input="onInput"
          @confirm="onConfirm"
          @keyboardheightchange="onkeyboardheightchange"
      />
      <template v-if="type === 'password' && passwordIcon">
        <!-- 开启密码时显示小眼睛 -->
        <uni-icons
            v-if="isVal"
            class="content-clear-icon"
            :class="{ 'is-textarea-icon': type === 'textarea' }"
            :type="showPassword ? 'eye-slash-filled' : 'eye-filled'"
            :size="22"
            :color="focusShow ? primaryColor : '#c0c4cc'"
            @click="onEyes"
        ></uni-icons>
      </template>
      <template v-else-if="suffixIcon">
        <uni-icons v-if="suffixIcon" class="content-clear-icon" :type="suffixIcon" color="#c0c4cc"
                   @click="onClickIcon('suffix')" size="22"></uni-icons>
      </template>
      <template v-else>
        <uni-icons
            v-if="clearable && isVal && !disabled && type !== 'textarea'"
            class="content-clear-icon"
            :class="{ 'is-textarea-icon': type === 'textarea' }"
            type="clear"
            :size="clearSize"
            :color="msg ? '#dd524d' : focusShow ? primaryColor : '#c0c4cc'"
            @click="onClear"
        ></uni-icons>
      </template>
      <slot name="right"></slot>
    </view>
  </view>
</template>

<script>
/**
 * Easyinput 输入框
 * @description 此组件可以实现表单的输入与校验，包括 "text" 和 "textarea" 类型。
 * @tutorial https://ext.dcloud.net.cn/plugin?id=3455
 * @property {String}  value  输入内容
 * @property {String }  type  输入框的类型（默认text） password/text/textarea/..
 *  @value text      文本输入键盘
 *  @value textarea  多行文本输入键盘
 *  @value password  密码输入键盘
 *  @value number    数字输入键盘，注意iOS上app-vue弹出的数字键盘并非9宫格方式
 *  @value idcard    身份证输入键盘，信、支付宝、百度、QQ小程序
 *  @value digit    带小数点的数字键盘  ，App的nvue页面、微信、支付宝、百度、头条、QQ小程序支持
 * @property {Boolean}  clearable  是否显示右侧清空内容的图标控件，点击可清空输入框内容（默认true）
 * @property {Boolean}  autoHeight  是否自动增高输入区域，type为textarea时有效（默认true）
 * @property {String }  placeholder  输入框的提示文字
 * @property {String }  placeholderStyle  placeholder的样式(内联样式，字符串)，如"color: #ddd"
 * @property {Boolean}  focus  是否自动获得焦点（默认false）
 * @property {Boolean}  disabled  是否禁用（默认false）
 * @property {Number }  maxlength  最大输入长度，设置为 -1 的时候不限制最大长度（默认140）
 * @property {String }  confirmType  设置键盘右下角按钮的文字，仅在type="text"时生效（默认done）
 * @property {Number }  clearSize  清除图标的大小，单位px（默认15）
 * @property {String}  prefixIcon  输入框头部图标
 * @property {String}  suffixIcon  输入框尾部图标
 * @property {String}  primaryColor  设置主题色（默认#2979ff）
 * @property {Boolean}  trim  是否自动去除两端的空格
 * @property {Boolean}  cursorSpacing  指定光标与键盘的距离，单位 px
 * @value both  去除两端空格
 * @value left  去除左侧空格
 * @value right  去除右侧空格
 * @value start  去除左侧空格
 * @value end    去除右侧空格
 * @value all    去除全部空格
 * @value none  不去除空格
 * @property {Boolean}  inputBorder  是否显示input输入框的边框（默认true）
 * @property {Boolean}  passwordIcon  type=password时是否显示小眼睛图标
 * @property {Object}  styles  自定义颜色
 * @event {Function}  input  输入框内容发生变化时触发
 * @event {Function}  focus  输入框获得焦点时触发
 * @event {Function}  blur  输入框失去焦点时触发
 * @event {Function}  confirm  点击完成按钮时触发
 * @event {Function}  iconClick  点击图标时触发
 * @example <uni-easyinput v-model="mobile"></uni-easyinput>
 */
function obj2strClass(obj) {
  let classess = '';
  for (let key in obj) {
    const val = obj[key];
    if (val) {
      classess += `${key} `;
    }
  }
  return classess;
}

function obj2strStyle(obj) {
  let style = '';
  for (let key in obj) {
    const val = obj[key];
    style += `${key}:${val};`;
  }
  return style;
}

export default {
  name: 'uni-easyinput',
  emits: ['click', 'iconClick', 'update:modelValue', 'input', 'focus', 'blur', 'confirm', 'clear', 'eyes', 'change', 'keyboardheightchange'],
  model: {
    prop: 'modelValue',
    event: 'update:modelValue'
  },
  options: {
    virtualHost: true
  },
  inject: {
    form: {
      from: 'uniForm',
      default: null
    },
    formItem: {
      from: 'uniFormItem',
      default: null
    }
  },
  props: {
    name: String,
    value: [Number, String],
    modelValue: [Number, String],
    type: {
      type: String,
      default: 'text'
    },
    clearable: {
      type: Boolean,
      default: true
    },
    autoHeight: {
      type: Boolean,
      default: false
    },
    placeholder: {
      type: String,
      default: ' '
    },
    placeholderStyle: String,
    focus: {
      type: Boolean,
      default: false
    },
    disabled: {
      type: Boolean,
      default: false
    },
    maxlength: {
      type: [Number, String],
      default: 140
    },
    confirmType: {
      type: String,
      default: 'done'
    },
    clearSize: {
      type: [Number, String],
      default: 24
    },
    inputBorder: {
      type: Boolean,
      default: true
    },
    prefixIcon: {
      type: String,
      default: ''
    },
    suffixIcon: {
      type: String,
      default: ''
    },
    trim: {
      type: [Boolean, String],
      default: false
    },
    cursorSpacing: {
      type: Number,
      default: 0
    },
    passwordIcon: {
      type: Boolean,
      default: true
    },
    primaryColor: {
      type: String,
      default: '#2979ff'
    },
    styles: {
      type: Object,
      default() {
        return {
          color: '#333',
          backgroundColor: '#fff',
          disableColor: '#F7F6F6',
          borderColor: '#e5e5e5'
        };
      }
    },
    errorMessage: {
      type: [String, Boolean],
      default: ''
    }
  },
  data() {
    return {
      focused: false,
      val: '',
      showMsg: '',
      border: false,
      isFirstBorder: false,
      showClearIcon: false,
      showPassword: false,
      focusShow: false,
      localMsg: '',
      isEnter: false // 用于判断当前是否是使用回车操作
    };
  },
  computed: {
    // 输入框内是否有值
    isVal() {
      const val = this.val;
      // fixed by mehaotian 处理值为0的情况，字符串0不在处理范围
      if (val || val === 0) {
        return true;
      }
      return false;
    },

    msg() {
      // console.log('computed', this.form, this.formItem);
      // if (this.form) {
      // 	return this.errorMessage || this.formItem.errMsg;
      // }
      // TODO 处理头条 formItem 中 errMsg 不更新的问题
      return this.localMsg || this.errorMessage;
    },
    // 因为uniapp的input组件的maxlength组件必须要数值，这里转为数值，用户可以传入字符串数值
    inputMaxlength() {
      return Number(this.maxlength);
    },

    // 处理外层样式的style
    boxStyle() {
      return `color:${this.inputBorder && this.msg ? '#e43d33' : this.styles.color};`;
    },
    // input 内容的类和样式处理
    inputContentClass() {
      return obj2strClass({
        'is-input-border': this.inputBorder,
        'is-input-error-border': this.inputBorder && this.msg,
        'is-textarea': this.type === 'textarea',
        'is-disabled': this.disabled,
        'is-focused': this.focusShow
      });
    },
    inputContentStyle() {
      const focusColor = this.focusShow ? this.primaryColor : this.styles.borderColor;
      const borderColor = this.inputBorder && this.msg ? '#dd524d' : focusColor;
      return obj2strStyle({
        'border-color': borderColor || '#e5e5e5',
        'background-color': this.disabled ? this.styles.disableColor : this.styles.backgroundColor
      });
    },
    // input右侧样式
    inputStyle() {
      const paddingRight = this.type === 'password' || this.clearable || this.prefixIcon ? '' : '10px';
      return obj2strStyle({
        'padding-right': paddingRight,
        'padding-left': this.prefixIcon ? '' : '10px'
      });
    }
  },
  watch: {
    value(newVal) {
      this.val = newVal;
    },
    modelValue(newVal) {
      this.val = newVal;
    },
    focus(newVal) {
      this.$nextTick(() => {
        this.focused = this.focus;
        this.focusShow = this.focus;
      });
    }
  },
  created() {
    this.init();
    // TODO 处理头条vue3 computed 不监听 inject 更改的问题（formItem.errMsg）
    if (this.form && this.formItem) {
      this.$watch('formItem.errMsg', newVal => {
        this.localMsg = newVal;
      });
    }
  },
  mounted() {
    this.$nextTick(() => {
      this.focused = this.focus;
      this.focusShow = this.focus;
    });
  },
  methods: {
    /**
     * 初始化变量值
     */
    init() {
      if (this.value || this.value === 0) {
        this.val = this.value;
      } else if (this.modelValue || this.modelValue === 0 || this.modelValue === '') {
        this.val = this.modelValue;
      } else {
        this.val = null;
      }
    },

    /**
     * 点击图标时触发
     * @param {Object} type
     */
    onClickIcon(type) {
      this.$emit('iconClick', type);
    },

    /**
     * 显示隐藏内容，密码框时生效
     */
    onEyes() {
      this.showPassword = !this.showPassword;
      this.$emit('eyes', this.showPassword);
    },

    /**
     * 输入时触发
     * @param {Object} event
     */
    onInput(event) {
      let value = event.detail.value;
      // 判断是否去除空格
      if (this.trim) {
        if (typeof this.trim === 'boolean' && this.trim) {
          value = this.trimStr(value);
        }
        if (typeof this.trim === 'string') {
          value = this.trimStr(value, this.trim);
        }
      }
      if (this.errMsg) this.errMsg = '';
      this.val = value;
      // TODO 兼容 vue2
      this.$emit('input', value);
      // TODO　兼容　vue3
      this.$emit('update:modelValue', value);
    },

    /**
     * 外部调用方法
     * 获取焦点时触发
     * @param {Object} event
     */
    onFocus() {
      this.$nextTick(() => {
        this.focused = true;
      });
      this.$emit('focus', null);
    },

    _Focus(event) {
      this.focusShow = true;
      this.$emit('focus', event);
    },

    /**
     * 外部调用方法
     * 失去焦点时触发
     * @param {Object} event
     */
    onBlur() {
      this.focused = false;
      this.$emit('focus', null);
    },
    _Blur(event) {
      let value = event.detail.value;
      this.focusShow = false;
      this.$emit('blur', event);
      // 根据类型返回值，在event中获取的值理论上讲都是string
      if (this.isEnter === false) {
        this.$emit('change', this.val);
      }
      // 失去焦点时参与表单校验
      if (this.form && this.formItem) {
        const {validateTrigger} = this.form;
        if (validateTrigger === 'blur') {
          this.formItem.onFieldChange();
        }
      }
    },

    /**
     * 按下键盘的发送键
     * @param {Object} e
     */
    onConfirm(e) {
      this.$emit('confirm', this.val);
      this.isEnter = true;
      this.$emit('change', this.val);
      this.$nextTick(() => {
        this.isEnter = false;
      });
    },

    /**
     * 清理内容
     * @param {Object} event
     */
    onClear(event) {
      this.val = '';
      // TODO 兼容 vue2
      this.$emit('input', '');
      // TODO 兼容 vue2
      // TODO　兼容　vue3
      this.$emit('update:modelValue', '');
      // 点击叉号触发
      this.$emit('clear');
    },

    /**
     * 键盘高度发生变化的时候触发此事件
     * 兼容性：微信小程序2.7.0+、App 3.1.0+
     * @param {Object} event
     */
    onkeyboardheightchange(event) {
      this.$emit("keyboardheightchange", event);
    },

    /**
     * 去除空格
     */
    trimStr(str, pos = 'both') {
      if (pos === 'both') {
        return str.trim();
      } else if (pos === 'left') {
        return str.trimLeft();
      } else if (pos === 'right') {
        return str.trimRight();
      } else if (pos === 'start') {
        return str.trimStart();
      } else if (pos === 'end') {
        return str.trimEnd();
      } else if (pos === 'all') {
        return str.replace(/\s+/g, '');
      } else if (pos === 'none') {
        return str;
      }
      return str;
    }
  }
};
</script>

<style lang="scss">
$uni-error: #e43d33;
$uni-border-1: #dcdfe6 !default;

.uni-easyinput {
  /* #ifndef APP-NVUE */
  width: 100%;
  /* #endif */
  flex: 1;
  position: relative;
  text-align: left;
  color: #333;
  font-size: 14px;
}

.uni-easyinput__content {
  flex: 1;
  /* #ifndef APP-NVUE */
  width: 100%;
  display: flex;
  box-sizing: border-box;
  // min-height: 36px;
  /* #endif */
  flex-direction: row;
  align-items: center;
  // 处理border动画刚开始显示黑色的问题
  border-color: #fff;
  transition-property: border-color;
  transition-duration: 0.3s;
}

.uni-easyinput__content-input {
  /* #ifndef APP-NVUE */
  width: auto;
  /* #endif */
  position: relative;
  overflow: hidden;
  flex: 1;
  line-height: 1;
  font-size: 14px;
  height: 35px;
  // min-height: 36px;
}

.uni-easyinput__placeholder-class {
  color: #999;
  font-size: 12px;
  // font-weight: 200;
}

.is-textarea {
  align-items: flex-start;
}

.is-textarea-icon {
  margin-top: 5px;
}

.uni-easyinput__content-textarea {
  position: relative;
  overflow: hidden;
  flex: 1;
  line-height: 1.5;
  font-size: 14px;
  margin: 6px;
  margin-left: 0;
  height: 80px;
  min-height: 80px;
  /* #ifndef APP-NVUE */
  min-height: 80px;
  width: auto;
  /* #endif */
}

.input-padding {
  padding-left: 10px;
}

.content-clear-icon {
  padding: 0 5px;
}

.label-icon {
  margin-right: 5px;
  margin-top: -1px;
}

// 显示边框
.is-input-border {
  /* #ifndef APP-NVUE */
  display: flex;
  box-sizing: border-box;
  /* #endif */
  flex-direction: row;
  align-items: center;
  border: 1px solid $uni-border-1;
  border-radius: 4px;
  /* #ifdef MP-ALIPAY */
  overflow: hidden;
  /* #endif */
}

.uni-error-message {
  position: absolute;
  bottom: -17px;
  left: 0;
  line-height: 12px;
  color: $uni-error;
  font-size: 12px;
  text-align: left;
}

.uni-error-msg--boeder {
  position: relative;
  bottom: 0;
  line-height: 22px;
}

.is-input-error-border {
  border-color: $uni-error;

  .uni-easyinput__placeholder-class {
    color: mix(#fff, $uni-error, 50%);
  }
}

.uni-easyinput--border {
  margin-bottom: 0;
  padding: 10px 15px;
  // padding-bottom: 0;
  border-top: 1px #eee solid;
}

.uni-easyinput-error {
  padding-bottom: 0;
}

.is-first-border {
  /* #ifndef APP-NVUE */
  border: none;
  /* #endif */
  /* #ifdef APP-NVUE */
  border-width: 0;
  /* #endif */
}

.is-disabled {
  background-color: #f7f6f6;
  color: #d5d5d5;

  .uni-easyinput__placeholder-class {
    color: #d5d5d5;
    font-size: 12px;
  }
}
</style>
